My boyfriend lied to me about going to a rave?

So I've been dating my boyfriend for a little over a year, and we're currently doing long distance only for the holidays because we're from different countries. Ever since the Christmas break began, things started to get a little rocky (smth to do with his older sister being jealous but that's a whole different topic). Anyways, the other night, my boyfriend told me that he was "taking a nap" when in actual reality, I have photo and video proof that he went to a rave with his sister and some other people from mutual friend's snapchats. After this, I gave my boyfriend many opportunities to come clean by asking "oh so you really took a nap?"/"you did nothing else that day?" and with every chance I gave him, he replied with a "no". I then thought to FaceTime him for his new years, because I entered mine shitty (the same night I found out he lied to me and went to this rave), and I didn't want his to start off the way mine did. So when I called him and saw him face to face, I asked him one last time "so is there ANYTHING you'd like to tell me or anything you think i'd want to know about before your new year starts?" and again, he said "no." After a few minutes into his new year, I told him that I absolutely HATE liars, and he began to look really guilty and kept repeatedly asking if something was up. Then he said "you know, I have actually lied about a few things" and he finally told me he lied about napping that day. And that he drank so much to numb the "pain" due to our relationship being a little rocky at the moment. then he said he blacked out and doesn't remember anything after that... So, he has yet to come clean about having gone to a rave (and got knows what else he's done at the rave). I don't know what to do anymore because I know he didn't black out that hard to the point where he doesn't remember PHYSICALY being at a rave for MULTIPLE hours? Plus, he was dancing in the videos that I saw him in. I've given him many chances to come clean. I don't know what to do now.
My boyfriend lied to me about going to a rave?
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